Taranakite Mineral Data

Taranakite Mineral Data
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General Taranakite Information

Help on Chemical Formula: Chemical Formula: K3Al5(HPO4)6(PO4)2•18(H2O)
Help on Composition: Composition: Molecular Weight = 1,342.30 gm
   Potassium    8.74 %  K    10.53 % K2O
   Aluminum    10.05 %  Al   18.99 % Al2O3
   Phosphorus  18.46 %  P    42.30 % P2O5
   Hydrogen     3.15 %  H    28.18 % H2O
   Oxygen      59.60 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K3Al5(HPO4)6(PO4)2•18(H2O)
Help on Environment: Environment: Formed from phosphatic solutions derived from bird or bat guano reacting with clays or aluminous rocks under perenially damp conditions
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1882
Help on Locality: Locality: Sugarloaves, near New Plymouth, Taranaki Peninsula, New Zealand. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Taranakite + Pronunciation Say TARANAKITE
Help on Synonym: Synonym: ICSD 85750
  PDF 29-981
 

Taranakite Image

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Taranakite

Comments: Bright white chalky powdery taranakite mass.
Location: South Farallon Island, near San Francicso, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Taranakite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:10.92214
Help on Cell Dimensions: Cell Dimensions: a = 8.7025, c = 95.05, Z = 6; V = 6,234.06 Den(Calc)= 2.15
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 15.5(1), 3.83(0.8), 7.6(0.8),
Click Here for Large Taranakite Structure Window Crystal Structure:

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Dick S , Gossner U , Weiss A , Robl C , Grossman G , Ohms G , Zeiske T , Inorganica Chimica Acta , 269 (1998) p.47-57, Taranakite - the mineral with the longest crystallographic axis, Locality: synthetic

 

Physical Properties of Taranakite

Help on Color: Color: Gray white, Yellowish white, White.
Help on Density: Density: 2.09
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luminescence: Luminescence: Non-Fluorescent.
Help on Streak: Streak: white
 

Optical Properties of Taranakite

Help on Optical Data: Optical Data: NCalc= 1.5 - from Gladstone-Dale relationship (KC = 0.2332) where Ncalc=Dcalc*KC+1
NCalc= 1.49 - from Gladstone-Dale relationship (KC = 0.2332) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Taranakite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.19 gm/cc
note: Specific Gravity of Taranakite =2.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000301283
Boson Index = 0.999698717
Help on Photoelectric: Photoelectric: PETaranakite = 2.09 barns/electron
U=PETaranakite x relectron= 4.58 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 128.51 (Gamma Ray American Petroleum Institute Units)
Concentration of Taranakite per GRapi unit = 0.78 (%)

Estimated Radioactivity from Taranakite - barely detectable

 

Taranakite Classification
Help on Dana Class: Dana Class: 39.03.06.01 (39)Hydrated Acid Phosphates, etc
  (39.03)with miscellaneous formulae
  (39.03.06)Dana Group
 
39.03.06.01 Taranakite K3Al5(HPO4)6(PO4)2•18(H2O) R 3c 3 2/m
Help on Strunz Class: Strunz Class: 08.CH.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CH -With large and medium-sized cations, RO4:H2O < 1:1
 
08.CH.25 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8•13(H2O) R 3c or R 3c Trig
 
08.CH.25 Taranakite K3Al5(HPO4)6(PO4)2•18(H2O) R 3c 3 2/m
 

Other Taranakite Information
Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Taranakite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Taranakite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Taranakite Specimen Label here :

Taranakite

K3Al5(HPO4)6(PO4)2•18(H2O)
Dana No: 39.03.06.01 Strunz No: 08.CH.25
Locality:

 

Notes: